Summary: Complete network graphing solution designed on top of RRDTool

Cacti is a complete frontend to RRDTool. It stores all of the necessary
information to create graphs and populate them with data in a MySQL
database.
The frontend is completely PHP driven. Along with being able to maintain
graphs, data sources, and round robin archives in a database, Cacti also
handles the data gathering. There is SNMP support for those used to
creating traffic graphs with MRTG.